Improvement in elevators



NFEIERS, PHUI'ULITHOGHAFHER. WASHINGTON. D. C,

,atod- 1 (that.

Lettersl Patent No. 109,232, dated November-'15, 1870.

IMPRovl-:MENT In ELI-:vA-rons.-

The Schedule referred to in these Letters Patent and making part of the same.

To all whom 'it may concern:

15e it known that I, Geenen Mclinxzrn, vof Zanesville, in the county of Muskingum and State of Ohio, have invented a new and useful improvement in Elevators; and I do hereby declare that the following` is a full, clear, and exact description of the same, reference being had to the accompanying drawing forming part of this specification, in whieh- Figure lis' a side view of my improved elevator, the shaft partly iu section.

Figure 2 is a top or plan view.

Similar' letters of reference indicate corresponding parts. v

This invention relates to that class of devices known as self-elevators; and

It consists-,

First, in the means for successively increasing the height of a vertical shaft so that the carriage which moves on the'shaft may be elevated relatively to the number of sections applied to the shaft'.

Second, 'in the means of holding/thc carriage at any V desired height.

Third, in the `method of'pivoting and bracing thc vertical shaft upon which the carriage moves.

Fourth, in a weighted pawl arranged upon the carriage so as toengage automatically with the gearwhecls and arrest the descent of the carriage, should the operator by accident losel control ol' the hoisting mechanism.

A A represents a vertical shaft, formed by a series of hollow or solid shafts, joined together, if solid timher be used, by means of a hollow plato, a, which firmly surroululs and embraces both ends of the solid timber on cach side, or il' hollow timber be used, connecting them together' by menus of a plug or block of wood rigidly secured inone cud, which enters or lits snugly into the Opening of the corresponding shaft.

This hollow shaft l construct by uniting and tirmly seeming together several stout planks.

Moving freely up and down this shaft A is a carriage, Ii, carrying with it the platform or platforms C, oi' any length, width, or shape, and the. mechanism for raising and lowering said carriage.

This carriage Il has formed with it projecting lips l) b', on or near its top and bottom, li-om the top ones ct' which extend horizontal supports l) D, upon which the platform or platbrms U (l are secured by means of bolts, screws, or other devices.

l1) ll are braces, which radiate li'om the lower projections on`tho carriage. B, and are attached or otherwise securcdio the supports fl) l) andV plat-form or platforms C (j.

This carriage l5 has openings or slots in its sides,m which wheels F F are placed, having their journals restingin bearings l d, extending from the sides of the carriage B. By the use of said wheels the carriage has a tirm, steady, and free movement in its ascent and descent, the resista-nce also being lessened by the use of said wheels pressing against the sides of the vertical shaft.

Mounted upon the platform C, and immediately' over the carriage B, is located the hoisting mechanism for raising and lowering the carriage carrying the plattbrm.

G G represent the sides ofthe hoistingmachiner which foim bearings for the shafts H and I'.

Tln shaft II is provided with a small gear-wheel, J, and a crank, IQ. This wheel J gears or meshes into a larger wheel, L, ou the shaft I, which is provided or formed with a drum, M.

One end of the rope N is secured to the shaft I or drum M, and the other secured to a pulley, O, having a hook, p, or to a hook itself, which isreadily attached or joined to a pivotcd hook, I, working in and out of a slot, y, formed in the vertical shaft A; or, if it be desired, the hook I) can be dispensed with, and a metal bar inserted through the inside ofthe shaft about midway of the slot y, to which the pulley-hook p is easily connected.

Upon the platform C there is attached a metal bar, ll, which is provided with a handle, h, anda-hook, I, designed to hold the carriage carrying the platform,h by passing it over thc crank K of the shaft H, at any desired height. l

To further secure this object, and to overcome thc danger attending such elevations, I form a series of holes, nzm, transversely tlpejough the shaft and carriage, through which I insert a metal bar, thus securel y retaining the carriage and platform in the position desired, should the hooklof the bar R ne tampered with or become detached from the crank K. lt is a frequent occurrence, on raising and lowering the platforms of elevators, that the attendant Working the. crank, by acc-ident or oversight, allows -thc crank to fall or slip from his hands. To obviate such accidents, there is loca-ted upon the platform a selfoperating' pawl, consisting of a heavy arm, T, anda foot-piece, U, attached to t shaft, n, which vibrat-es freely in hearings o o.

It will be seen that as thel carriage I3 is raised or lowered, carrying with it the platform G, that the piece U is heid down by the pressure of the foot to discngagc the arm T from the wheel J; but should any accident occur that the operator -of the crank would release the same, the heavy arm T will immediately engage 'with the teeth of the wheel J, and arrest the falling of thc carriage and platform.

I lhe vertical shaft A is pivoted or otherwise secured in projections fj', extending from a bed-plate, \V,

v Irmly attached to the feet or arms B B', and is sel'orm in a horizontal position, should there he any in-V equalities in the ground where itis designed to be used.

To further increase the stability ot" the elevator, l have provided the feet or arms B with a seconda-ry or extension base or platform, D' D, which slide in andout tiom under or on the sides of the feet or arms B B', between the straps or braces 1 r.

, G represents a light-angular metal stake, which eneircles partly the feet or arms B B or D 1)', for the purpose of staking thesame securely to the ground.

Having thus described my invention,

What I. claim as new, and desire to secure by 1. 'lhe weighted pivoted pawl T, arranged upon the carriages and operating in connection with hoisting` mechanism, substantially as herein shown and described.

' 2. ',lhe swinging hool; l, located within the vertical shaft for the purpose described.

3. The carriage B, movinft, on tlieyertieal shaft A, carrying the radiating arms E E, supportingr the platform C with its hoisting mechanism, consisting ot` the frame (lr, hearing the wheels Land J with their drums, and its brake mechanism.

1t. The carriage B with its projections b b', to which is secured the radiating arms E E, supporting the platform U, carrying the hoisting mechanism consistin g of tl ieswheels L and J, with their drums, journaled to thesides G-G, and provided with a suitable crank, operating in connection with the pawl T, rope N, and hook 1?, substantially as described.

'lhoabovo si goed by me this 7 th day of March, ,1870.

GEO. MCK'ENZII".

Witnesses:

J om,Y A. WmDEnsHnnl, J AMES L. Nomos. 

